Death pall
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Death palls are an entity and weather event added by the Anomaly DLC that causes corpses exposed to it to be raised as shamblers.
Occurrence
Death pall is an entity event that reanimates the dead. It can be triggered by performing the Void Provocation ritual, or it can occur as a Major Threat. Unlike Grey Pall, its arrival is signified by a red event box.
This event cannot fire before day 15, and once fired, can only fire again after 30 days.[Provoked?]
Summary
Death pall will fall over the map tile for 1-3 days, and resurrect any non-mechanoid corpses which are not indoors and under a roof as Shamblers. This includes corpses that have already risen as Shamblers and have died from metabolic exhaustion. Corpses will not reanimate during a Death pall if they are burnt or otherwise destroyed.
Death pall can reanimate any and all corpses, including desiccated corpses and corpses missing vital body parts or organs (such as the head, torso or heart). Reanimated corpses will regenerate vital body parts, but non-vital body parts such as eyes/arms/etc will stay damaged/destroyed.
Death Pall requires a viable animable corpse to be possible. If there are no corpses on the map that could be reanimated due to Death Pall then the event cannot occur.
Death Pall blocks standard weather transitions. While Death Pall is active rain will not occur to put out fires.
Analysis
The only threat Death pall serves to your colony is the creation of shamblers, in the form of humanoid and animal corpses. Megasloths, Timber wolves, Thrumbos and other dangerous animals can be bought back from the dead as aggressive shamblers if left outdoors. It is best to butcher or burn corpses which are laying around outdoors, in order to prevent any accidental shambler creation.
An alternate tactic could be to leave corpses outside of your base, in order for them to rise during the Death pall and attack your enemies. However, this will leave your base surrounded by shamblers that will also be aggressive to you.
A corpse simply being under a roof will not prevent it from reanimating during a death pall. To prevent reanimation, a corpse must be under a roof and inside a fully enclosed room. Corpses that are under a roof outdoors, or are not under a roof indoors will still reanimate. The room containing the corpse does not have to be entirely roofed - reanimation will not occur as long as it is enclosed and the corpse itself is under a roof tile.